#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
class MoveFileCommand(object):
def __init__(self, src, dest):
self.src = src
self.dest = dest
def execute(self):
print('renaming {} to {}'.format(self.src, self.dest))
os.rename(self.src, self.dest)
def undo(self):
print('renaming {} to {}'.format(self.dest, self.src))
os.rename(self.dest, self.src)
def main():
command_stack = []
# commands are just pushed into the command stack
command_stack.append(MoveFileCommand('foo.txt', 'bar.txt'))
command_stack.append(MoveFileCommand('bar.txt', 'baz.txt'))
# they can be executed later on
for cmd in command_stack:
cmd.execute()
# and can also be undone at will
for cmd in reversed(command_stack):
cmd.undo()
if __name__ == "__main__":
main()
### OUTPUT ###
# renaming foo.txt to bar.txt
# renaming bar.txt to baz.txt
# renaming baz.txt to bar.txt
# renaming bar.txt to foo.txt